[PATCH] [AArch64] Refactor AArch64NamedImmMapper to become dependent on subtarget features.

[Vladimir Sukharev]

Eric, AsmParser is already dependent on subtargetfeatures since http://reviews.llvm.org/rL207742 .
I have just extended this approach from SysRegMapper (plus its children MSRMapper, MRSMapper) to other mappers.
Would you comment on you doubts?


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8496

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